Home > Developer > Web Develop
page :
Message servlet-----Messageservlet
Package CN. MuJH.newsManager.servlet;
Import java.io.IOException;
Import Java.text.SimpleDateFormat;
Import Java.util.Date;
Import java.util.List;
Import javax.servlet.ServletException;
Import Javax.servlet.annotation.WebServlet;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import Cn.MuJH.newsManager.biz.MessageManager;
Import Cn.MuJH.newsManager.biz.impl.MessageManagerImpl;
Import CN. MuJH.newsManager.entity.Message;
Import CN. MUJH.NEWSMANAGER.ENTITY.PAGEMSG;
@WebServlet (name = "MSG", Urlpatterns = {"/msg"})
public class Messageservlet extends HttpServlet {
Private static final long serialversionuid = 1L;
Public Messageservlet () {
Super ();
}
protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
DoPost (request, response);
}
protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
MessageManager mm=new Messagemanagerimpl ();
String OPR = Request.getparameter ("mth");
String author =request.getparameter ("author");
String message =request.getparameter ("message");
if (opr!=null) {
if (Author!=null | | author!= "") {
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");
Message msg=new Message (0,author,message,sdf.format (new Date ()));
Mm.addmsg (msg);
}
}else{
Request.setattribute ("author", author);
Request.setattribute ("message", message);
}
Pagemsg page=new pagemsg ();
Page.setpagesize (5);//per page show number of message lines
int Totalpage=mm.gettotalcount ()%page.getpagesize () ==0?mm.gettotalcount ()/page.getpagesize (): Mm.getTotalCount () /page.getpagesize (+1);
Page.settotalpage (Totalpage);
if (Request.getparameter ("PageIndex") ==null| | Request.getparameter ("pageIndex") = = "") {
Page.setpageindex (1);
}else{
Page.setpageindex (Integer.parseint (Request.getparameter ("PageIndex"));
}
List<message> List=mm.getmessagebypageindex (Page.getpageindex (), page.getpagesize ());
Page.setlist (list);
Request.setattribute ("page", page);
Request.getrequestdispatcher ("message.jsp"). Forward (request, response);
}
}
See figure:
Page Content---message.jsp
<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "
pageencoding= "UTF-8"%>
<% @taglib uri= "Http://java.sun.com/jsp/jstl/core" prefix= "C"%>
<! Doctype>
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 ">
<title>insert title here</title>
<script type= "Text/javascript" src= "Js/jquery1.8.0.min.js" ></script>
<body>
<c:foreach items= "${page.list}" var= "MSG" >
<p>${msg.author}</p>
<p> content: ${msg.message}</p>
<p> Release date: ${msg.pubdate}</p>
</c:forEach>
<input type= "button" value= "previous" onclick= "Fenye (${page.pageindex-1})"
<c:if test= "${page.pageindex eq 1}" >disabled= "Disabled" </c:if>
>
<input type= "button" value= "Next" onclick= "Fenye (${page.pageindex+1})"
<c:if test= "${page.pageindex eq page.totalpage}" >disabled= "Disabled" </c:if>
>
<form action= "Msg?mth=save" method= "post" id= "MyForm" onsubmit= "return Check ()" >
<p> Username: <input type= "text" name= "author" id= "author" value= "${author}"/></p>
<p> message: <input type= "text" name= "message" id= "message" value= "${message}"/></p>
<p><input type= "Submit" value= "Leave a Message"/></p>
<input type= "hidden" name= "PageIndex" id= "PageIndex" >
</form>
<script>
function Check () {
if (document). getElementById ("Author"). value== "") {
Alert ("User name cannot be empty");
document.getElementById ("author"). focus ();
return false;
}
if (document). getElementById ("message"). value== "") {
Alert ("User name cannot be empty");
document.getElementById ("message"). focus ();
return false;
}
return true;
}
function Fenye (pageIndex) {
document.getElementById ("PageIndex"). Value=pageindex;
document.getElementById ("MyForm"). action= "MSG";
document.getElementById ("MyForm"). Submit ();
}
</script>
</body>
See figure:
Underlying code Picture: Message entity class
----Messagedao
The implementation class of the interface----Messagedaoimpl
----MessageManager
----Messagemanagerimpl
Database pictures:
JSP implementation of the message Board page display, the new message displayed in the first ~
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
